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Share Repurchase Plan (Narrative) (Details) - USD ($) $ in Thousands | 6 Months Ended
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Feb. 28, 2021 | Feb. 29, 2020
Equity, Class of Treasury Stock [Line Items] |  |
Total cost of repurchased shares |  | $ 9,658
2021 Share Repurchase Program [Member] |  |
Equity, Class of Treasury Stock [Line Items] |  |
Total cost of repurchased shares | $ 0 |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The cash outflow to reacquire common stock during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |